novtck and e



` A. NOV'fCK AND E. FISH. LIQUID LEVEL INDLCATOR.v APPLICATION FILED 0202's, I92I.

Reissued Sept. 5, 1922. I 1 5,447

E75 74 51315108 7,5 L I 70 79 Abramwovick Ewarlish" L Ressued Sept. 5, 1922.

l Re. 15,447 'A UNI-TED lSTATES PATENT, orifice ABRAHAMNOVICK', 0F BRooKLYN, NEW YORK, AND. rmWARIDllIspH, OFNW YORK,

" y N. Y., ASSIGNGRS To FERDINAND ln SMITHE, or NEW YORK, N. Y.

LIQUID LEVEL lammeren.` 4 l riginal No; 153911,336, dated Dctober 18, M21, Sera1`Nef-441,722, filed February :2, 1921. Application v i i' g for ,reissue filed December 2B, w21. Serial N; 526,028.7-

To all ,1v/10m time?) donnera: Beit known that We, ABRAHAM Novich: and EDWARD FISH, citizens of the United States, and residing,irespeetively,y at New 5 Yorlnbori'nurh oilrooklyn, in the Count-y ot Kings and State ot New York, and at New York, borough oli lslanhattan, in the county of New,l York and State of New York, have. invented certain new and useful lmprovements in Liqiiid Level indicators, of

which the following` is a speriiifcation.

This ,invention relates toizulirators and partit-,ularly to that-Class thereof which is adapted for indicating7 preferably on a scale, thefheiglift of a body et lliquid insa tank remote from the scale and located at any heigbtrelatir-ely to saidseale.

The object of our infprovernents is to provide an indicator of the class specified, simple yin ronstruetion, arf-curate. in operation, and \vliiel1 inay bey used with equal' 'facility in a number of differeiit environments.

W ith these ends in view our `,in'iprove ments 'comprise features which e illus- Zftilrated' iutheir preferred embodizn'int in the drawings accompanying this' speeieation, wherein Figure l is a side elevatinnylargr ly in si ation, ot" a tank and in'ilirator te wlneh our irnprevui'uants are applied. Fig'. 2, is a Sif'ievfsiinilar to that oft lf'ig. l und illustrating n nuxlilieatinn n nur improvements.

indicators ni. this general blass 0f wliieh we have knowledge, while in many `eases giv-` ing -exrellent servire in Vstatimiarjy installaiitions, have been unsatistaetory het-:ruse of inaeeur'ar i'vluinappiied to moving .'ehielesq ul'onmliiles. ln surh seryire the car on whirl] they are ni'ouuted is subject to the unevenuess'es it the road and particularly in *going up and down l1iils,when the indif-ator i. liable to sui-il elmugls ntrrlatinn tn the tank' as to cause the reading to be erroneous. ln our in'iproirnienis we. have eliminated these rlii'iieultiesaiul have provided an inlltllirtnve l annui-ary and reliability.l

Direr'ting attention now to Fig; 'l of the drawings1 2 is a tank, such tor instai'ue as is adapted inr holding' the -gasolene sup'g'ily in :in autolnol'aile. VThis tank may be pro- 5 i "iihd with the usual supply pipe 2l leading"r to the engine, not shown. Leading from the bottom of tank 21 to some more' unless distant point,fherein shown as definitely laboi'e the level. oisaid tank, is pipe 3 of relatively small diameter, the upper and preferably vertical portion of which terminatesl in retnrnloop4 and end 5 of said loop. as by'.

or inverted to bend is connected, coupling 6, with the upper end of a short length of transparent tube 7. Just above coupling 6 in portion 5 of pipe 3 is vent cock 22. At some convenient location, `Ias for instance below tank 21 is diaphragm box S having chamber 9'one wall of which is .formed by leXible diaphragm `10. Leadingv from said Chamber 9 is pipe l1 similar to pipe 3.an'd terminating at coupling 12l by which it is connected with the lower, l

end of' said transparent tube 7; Dia- 'phragrn box chamber 9 may be providedwith a filling opening Iclosed by plug 13. The lower face of diaphragm 10 is exposed toV the atmosphere but may be protected from dirt by easing 14 in which is port 15 communicating with the atmosphere. Tube 'i' may be Aprowfded withY ygraduated scale 16 adjacent thereto, against which may be read the height oi. the liquid in said tube. In the modification of Fig. 25 pipe l? leads from the usual air pressure pump, net shown, into tank 2 and branch 18 otisaid pipe leads into rasingr 14 below diaphragm .10. In this inndifieation port 15 is closed by ping 19. ly this means an equal pressure is maina tained in the tank 2 and below diaphragm 1U. ln the arrangement of Fig. l equal atnimipherir pressure is maintained by hav- 1 ing the tank open to the atmosphere through vent 2() and the diaphragm open at the atuiosphere through port 15. A y

The operation ot'` our improved device. is as follows: Tank 2 is provided with gasolene er other liquid to'be gag-ed, say to about half its capacity. yThen by means of an air pump applied to vent 20 the liquid is forced up\\'ardly in pipe-3 te level 23. preferably just above the topof transparent ,tube 7 and heldat thatlevel. *l ,l y

'ifhile wei-prefr-ufably tnrce the liquid to be gag-ed to about said lem-l 2B, a level either higher or lower than that indicated is elli cient.

Their rhainber 9 and pipe ll are filled with :1n-indicating' liquid, such as colored ali-ohci, through the openingl closed by plug i3 andthe level of such liquid is forcedA I be raised by the increased weight of li uid Aby a narrow rang then closed and plug 1 3 replaced. Thev weight of the liquid in pipe 11 will cause diaphragm 10 to be deflected'sliglitly downwardly. The apparatus is now ready for' use. If now the contents of tank 2 be increased, the height of the liquid at 23 will in the tank, the pressure transmitting uid such as 'air between the top of the liquid at 23 and the top of the indicatin liquid in tube .7v will force downwardly. the level of the liquid in tube 7 and pipe'll, and discharge the surplus liquid into chamber 9, thereby delecting diaphragm, 10 downwardly. On the other hand if a portion of the liquid in tank 2 be withdrawn, the relief of pressure by the decreased -weight ot said liquid will cause the level 23 of th e liquid in pipe 3 to fall, thereby permittingv diaphragm 10 to force a portion of the liquid in chamber 9 upwardly into pipe 411,-thereby raising the level of that liquid in tube 7. It will be understood that the deiiection of diaphragm 10 due to variations in 'the amount of liquid in tank 2 is -very slight and that the consequent variation in' the `height ofthe level of the indicating liquid in tube 7 is also slight, so that a wide-.range in the height of the liquid in tank 2 1s indicated tively short transparent tube and indicating scale may be used. It will alsovbe-noted that as the indicating liquid in chamber 9,

ipe 11 and tube 7 is sealed in place,'it cannot be aifected by Van shifting'- cf position of the device but only y changes in pressure on its top level in tube 7 due to changes in the amount of liquid in tank 2. Thea paratus is therefore accurate and rehab e under varying conditions.

We claim: Y

1. In a liquid level indicator a tank for holding the liquid to be gag'cd, means forining a chamber and having a yieldable diaphragm forming one wall ot the .chamber, a pipe connecting the bottom portion of said tank with said chamber and including a transparent portion, said chamber and that portion of said connecting pipe extending from said chamber to said transparent portion being filled with an indicating liqu1d, that portion of said pipe extending from said tank to saidl transparent portion being in the form of an inverted U-bend containing in that part thereof adjacent said tank liquid similar to that to be.gaged, and a pressure transmitting -uid 1n the` U-bend portion `of said pipe between the levels of the"t\vo li nids.

2.' In a iquid level indicator a tank for c of height in the liquid in tube 7. By this arrangement a comparaholding the liquid to be gaged, means forming a chamber and having a yieldable diaphragm forming one wall of the chamber, a

pipe connecting the bottom portion of said4 tank with said chamber and" including, a

transparent portion, said chamber and that portion of said connecting pipe extending from said chamber to said transparent por-` tion being filled with an indicating 1i uid, that portion of said pipe extending rom said tank to said transparent portion being in the form of an inverted U-bend containing in that part thereof adjacent said tank liquid similar to that to be gaged, there being an air-filled space in said pipe between the two liquids.

3. In a liquid level indicator a tank holdv ing' the liquid to be'gaged, means `forming a.`

chamber and having a yieldable diaphragm forming one wall of the chamber, a pipe connecting the bottom portion of said! `tank with said chamber and including a; transparent portion', said chamber and that portion of said connecting pipe extending-from said chamber to said transparent portion being filled with an indicating liquid and that portion of said pipe extending from Said tank to said transparent portion being in the form of an inverted U-bend containing 'a pressure transmitting Huid in addition to a portion of the liquid from the tank.

4;. In av liquid level indicator a tank for holding the liquid to be gaged, means forming a chamber and having a yieldable diapipe connecting the'bottom portion of said Ytank with said'ichamber and including a transparent portion, said chamber and that portion of said connecting pipe extending from said chamber to said transparent portion being filled with an indicating liquid, there being an air-filled space in that portion of said pipe extending from said tank to said transparent portion. i

5. In a liquid level indicator atank for holding the liquid to be gil-ged, means forming a-chamber and having a yieldable diaphragm forming one wall of the' chamber, a

pipe connectingr the bottom portion of said tank with said chamber and including a transparent portion, said chamber and that portion ot said connecting pipe extending from said chamber to said transparent portion beingnfilled with an indicating liquid, that portion of said pipe extending from said tank to said transparent portion conl taining a pressure transmitting Huid, a casing forming a chamber below the yieldable diaphragm, and a pipe leading from a source of air pressure to the upper portion ofsaid tank and to said casing whereby equal pressure is maintained in said tank and casing.

6. Ina liquid level indicator a tank for holding the liquid to be gaged, means forinl ing a chamber and having a yieldable diaphragm forming one wall of transparent portion, and means in a portion o'f Said pipe for4 indicating the height of fzthe liquid to be gaged, that .portion of Said pipe extending froln said tank to said indicating means containing a pressure transto a portlon of the` mitting fluid in addition 'li' uid from the tank.

, Ina level indicator for liquide the com- Abination of a tank for the liquid to be gaged, afdiaphragm box including a chamber havthereof, a

ing a yieldable diaphragm forming one Wall pipe connecting the bottom portion ofsaid tank withsald diaphragm boxl chamber, a transparent port-ion in said pipe,

ytion of said connecting pipe"extending,from

y`u saidl chamber to said transparent portion .I i. #being filled with an indicating liquid, that bportlon of said pipe extending from said tank to said transparent portion being filled, (135,.

near said transparent to fa point relativel dysimilar vto that to be 'portion with `liqui y l said diaphragm box chamber and that perf" 20, l

Y* 'levels of the two liquids.

gaged, and an air space in said pipe between the levels of the two liquids.

8. ln a level indicator for liquids the combination of a tank for the liquid to be gaged,l a diaphragm. box including a chamber having a yieldable diaphragm forming one wall thereof, a pipe connecting thebottom portion of said tank with said diaphragm box chamber and extending upwardly to a return loop and then downwardly to -said diaphragm box chamber, a ltransparent portion inthe downwardly extending portion of said pipe, said diaphragm box chamber and that portion of said 'connecting pipe extending 'from said chamber to said transpfu'ent portion being filled with an indicating liquid,

that portion -of said' pipe extending from said tank to said return loop being filled with liquid similar to that to be gaged, there being an air-filled space in said pipe between the In Witness whereof, We hereby aliix our signatures this l5 day of December, 1921.

ABRAHAM NoVIoK.

EDWARD FISH. 

